EP0769488B1 - Verfahren zur Herstellung von 3-Chlor-3'-nitro-4'methoxybenzophenon - Google Patents
Verfahren zur Herstellung von 3-Chlor-3'-nitro-4'methoxybenzophenon Download PDFInfo
- Publication number
- EP0769488B1 EP0769488B1 EP96114580A EP96114580A EP0769488B1 EP 0769488 B1 EP0769488 B1 EP 0769488B1 EP 96114580 A EP96114580 A EP 96114580A EP 96114580 A EP96114580 A EP 96114580A EP 0769488 B1 EP0769488 B1 EP 0769488B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- chloro
- methoxybenzophenone
- process according
- nitric acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C201/00—Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
- C07C201/06—Preparation of nitro compounds
- C07C201/08—Preparation of nitro compounds by substitution of hydrogen atoms by nitro groups
Definitions
- the present invention relates to a process for the preparation of 3-chloro-3'-nitro-4'-methoxybenzophenone with a very low content of dinitro derivatives in the raw material.
- 3-chloro-3'-nitro-4'-methoxybenzophenone is an intermediate used in the manufacture of active pharmaceutical ingredients (see e.g. EP-A-260744).
- the levels of dinitro derivatives at so manufactured products are generally less than 0.5% by weight. Preferably 70-80% by weight is used in the process according to the invention Sulfuric acid.
- the amount of sulfuric acid that serves as the reaction medium for nitration can be varied within wide limits. It is preferably dimensioned so that At the beginning of the reaction, an essentially homogeneous reaction mixture is formed and the stirrability of the reaction mixture present after the nitration reaction has ended is guaranteed.
- 500-2500 g of sulfuric acid can be used per 100 g of 3-chloro-4'-methoxybenzophenone. This amount is preferably 1,000-1,800 g.
- Nitric acid can e.g. are in the range 50-100% by weight.
- Prefers is 50 - 70 wt .-% nitric acid, especially as a concentrated nitric acid commercially available approx. 63% by weight goods.
- nitric acid can or be used in any mixtures with sulfuric acid. If one If such nitric acid / sulfuric acid mixtures are used, they can, for example from 30 to 60% by weight sulfuric acid (calculated as 100% by weight acid, in the present case as 96 to 100% by weight acid) and 40 to 70% by weight nitric acid the above Contain concentration.
- the amount of nitric acid for the process according to the invention can in principle can be varied over a wide range. 80-150% by weight of the amount required stoichiometrically. A lower amount of nitric acid leads to incomplete sales and is therefore uneconomical, an increase the amount of nitric acid is over 150% by weight of the stoichiometrically required Quantity beyond does not promote the selectivity of the reaction and is therefore out economic considerations make little sense. It is particularly preferred in the method used a quantity of nitric acid, the 90 - 120 wt .-% of the stoichiometrically required amount corresponds.
- the reaction temperature in the process according to the invention is from -20 to + 60 ° C.
- the reaction temperature is down due to the easing of the nitriding reaction and the then poor solubility of the 3-chloro-4'-methoxybenzophenone limited in sulfuric acid. Temperatures above 60 ° C often lead to a decrease in selectivity. Temperatures are in the range from 0 to + 40 ° C prefers.
- the crude product contained 1.5% by weight of the feed and a content of dinitro derivatives of less than 0.5% by weight.
- the redissolution of this raw material from 250 ml of isopropanol gave 23 g of a product with a purity of over 99% by weight. This corresponds to a yield of 88% of theory.
- the melting point of the cleaned goods was 113 ° C.
- Example 2 The procedure was as in Example 1, but the nitration was in 175 ml 75 wt .-% sulfuric acid at + 20 ° C and 11.5 g 65 wt .-% Nitric acid used. After isolation by filtration, washing and Drying gave a crude product with a purity of 94% by weight, which 3.5 wt% unreacted feed and less than 0.4 wt% dinitro derivatives contained. This crude product was made in the same way as in Example 1 described, cleaned and thus received a 99% by weight pure product.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Claims (7)
- Verfahren zur Herstellung von 3-Chlor-3'-nitro-4'-methoxybenzophenon durch Nitrierung von 3-Chlor-4'-methoxybenzophenon, dadurch gekennzeichnet, daß man die Nitrierung in 65 bis 85 gew.-%iger Schwefelsäure als Reaktionsmedium mit Salpetersäure bei Temperaturen im Bereich von -20 bis +60°C durchführt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man 70 bis 80 gew.-%ige Schwefelsäure einsetzt.
- Verfahren nach Ansprüchen 1 und 2, dadurch gekennzeichnet, daß man, bezogen auf 100 g 3-Chlor-4'-methoxybenzophenon, 500 bis 2 500 g Schwefelsäure einsetzt.
- Verfahren nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß Salpetersäure einer Konzentration im Bereich 50 bis 100 Gew.-% in einer Menge eingesetzt wird, die 80 bis 150 Gew.-% der stöchiometrisch erforderlichen Menge entspricht.
- Verfahren nach Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß man die Nitrierung bei 0 bis +40°C durchführt.
- Verfahren nach Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß man das nach Beendigung der Nitrierreaktion und gegebenenfalls nach Ablauf einer Nachrührzeit vorliegende Reaktionsgemisch aufarbeitet, indem man den gebildeten Niederschlag abfiltriert, den Filterkuchen wäscht und trocknet.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß man das nach Anspruch 6 erhaltene Rohprodukt durch Umlösung aus einem geeigneten Lösungsmittel weiter reinigt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19535500A DE19535500A1 (de) | 1995-09-25 | 1995-09-25 | Verfahren zur Herstellung von 3-Chlor-3'-nitro-4'-methoxybenzophenon |
DE19535500 | 1995-09-25 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0769488A2 EP0769488A2 (de) | 1997-04-23 |
EP0769488A3 EP0769488A3 (de) | 1997-07-16 |
EP0769488B1 true EP0769488B1 (de) | 1999-07-14 |
Family
ID=7773042
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96114580A Expired - Lifetime EP0769488B1 (de) | 1995-09-25 | 1996-09-12 | Verfahren zur Herstellung von 3-Chlor-3'-nitro-4'methoxybenzophenon |
Country Status (6)
Country | Link |
---|---|
US (1) | US5741936A (de) |
EP (1) | EP0769488B1 (de) |
JP (1) | JPH09216854A (de) |
DE (2) | DE19535500A1 (de) |
ES (1) | ES2135827T3 (de) |
HU (1) | HUP9602619A3 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6443629B1 (en) | 2000-02-22 | 2002-09-03 | Itt Manufacturing Enterprises, Inc. | Terminus body with trapped spring |
US9023954B1 (en) * | 2012-12-26 | 2015-05-05 | The United States Of America As Represented By The Secretary Of The Navy | Side-chain and end-group modified poly-p-phenylene oligomers |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH640216A5 (de) * | 1979-06-21 | 1983-12-30 | Ciba Geigy Ag | Verfahren zur herstellung von 4-acylamido-2-nitro-1-alkoxybenzol-verbindungen. |
US4339618A (en) * | 1979-06-21 | 1982-07-13 | Ciba-Geigy Ag | Process for the production of substituted nitroaryl compounds |
US4361704A (en) * | 1981-03-11 | 1982-11-30 | Gulf Research & Development Company | Process for preparing m,m'-dinitrobenzophenone |
US4560800A (en) * | 1984-09-17 | 1985-12-24 | Gulf Research & Development Co. | Isolation of m,m'-dinitrobenzophenone |
RO91633B1 (ro) * | 1985-02-18 | 1987-05-31 | Institutul De Cercetari Chimico-Farmaceutice | Procedeu de preparare a acidului 4-clor-3-nitrobenzofenon-2'-carboxilic |
NZ221729A (en) * | 1986-09-15 | 1989-07-27 | Janssen Pharmaceutica Nv | Imidazolyl methyl-substituted benzimidazole derivatives and pharmaceutical compositions |
-
1995
- 1995-09-25 DE DE19535500A patent/DE19535500A1/de not_active Withdrawn
-
1996
- 1996-09-12 EP EP96114580A patent/EP0769488B1/de not_active Expired - Lifetime
- 1996-09-12 DE DE59602431T patent/DE59602431D1/de not_active Expired - Fee Related
- 1996-09-12 ES ES96114580T patent/ES2135827T3/es not_active Expired - Lifetime
- 1996-09-18 US US08/710,474 patent/US5741936A/en not_active Expired - Fee Related
- 1996-09-19 JP JP8267692A patent/JPH09216854A/ja active Pending
- 1996-09-24 HU HU9602619A patent/HUP9602619A3/hu unknown
Also Published As
Publication number | Publication date |
---|---|
ES2135827T3 (es) | 1999-11-01 |
EP0769488A2 (de) | 1997-04-23 |
HUP9602619A2 (en) | 1997-03-28 |
DE59602431D1 (de) | 1999-08-19 |
US5741936A (en) | 1998-04-21 |
JPH09216854A (ja) | 1997-08-19 |
DE19535500A1 (de) | 1997-03-27 |
EP0769488A3 (de) | 1997-07-16 |
HU9602619D0 (en) | 1996-11-28 |
HUP9602619A3 (en) | 2000-03-28 |
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